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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82a53d4c881dd14e5c3c16bc551ab1920d559a4f60af752578257d46048e1d87' 
  AND token = 'JPjkIhj7Xqz8pC269jfNuMndb6aG/yMUcFQJf9RBoZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}